Facebook groups... pretty much just clusters of people getting together to share chip feeds (those links you can click to collect an extra 50k chips a day), tips, etc.
(Personally, I find the environment here to be much more interesting though.)
The social group is called MyVegas Friends and they have a post called ChipShare thread where there are 101 or 201 chips. You can get up to 50K / day.
See, I'm reaching across the aisle....
I believe that when you redeem, you have to link your FB/MV account to your MLife card. So unless you're doing an after-purchase transaction (handing over room keys, etc.), you'd have to be dedicating your entire MV history to somebody else.